Do Radiant Barriers Work? - LP Techshield Review

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Do radiant barriers actually work? If so, how do radiant barriers work?
Jordan tests LP Techshield Radiant Barrier to see if it actually reduces radiant energy emitting into the attic. Using a infrared thermometer he tests both a westwardly facing wall sheathed with LP WeatherLogic and then the west roof deck sheathed with LP Techshield radiant barrier. Even on a overcast winter day with less radiant energy beating on the roof, the wall read 10 degrees hotter!
Imagine what the difference would be in the middle of summer with the sun really shining!
A radiant barrier works by reducing the amount of radiant energy that is emitted into the attic. Emissivity is a materials capacity to radiate energy via infrared waves. The lower the emissivity, the less energy will radiate. Techshield has an aluminum coating on one side, that drastically reduces the emissivity of the material. Aluminum has an emissivity of around 0.05 while wood has an emissivity of 0.9! This means that woudl will radiate over 10 times more energy into an attic than an aluminum radiant barrier.
We must be careful, however, not to assume that Techshield will reduce our heat gain by 10X. Heat transfers in 3 different ways: Conduction (touching), Convection (fluid flow), and Radiation (infrared). Techshield will only reduce the radiated energy emitted into the attic. Anywhere the radiant barrier comes into contact with rafters or insulation, the heat transfer mode will change to conduction, and the radiant barrier will no longer be effective. Because of this fact, it is beneficial to reduce areas contact with Techshield radiant barrier. Advanced framing will help maximize the benefits, but spray foam will negate any benefits as it will come into contact with the radiant barrier.

Видео Do Radiant Barriers Work? - LP Techshield Review канала Jordan Smith